Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22732#discussion_r225735714
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala
---
@@ -81,11 +81,11 @@ case class UserDefinedFunction protected[sql] (
f,
dataType,
exprs.map(_.expr),
+ nullableTypes.map(_.map(!_)).getOrElse(exprs.map(_ => false)),
--- End diff --
Yes that's right. There are a number of UDFs in MLlib, etc that have inputs
of type "Any", which isn't great, but I wanted to work around rather than
change them for now.
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